Supporting Information

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1 Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry. This journal is The Royal Society of Chemistry 2018 Supporting Information Content Synthesis of compounds 2a, 2b in Scheme S1 Synthesis of intermediates as outlined in Scheme S-2 1 H-NMR of target compounds and 13 C-NMR of some target compounds Table S1. The data collection and refinement statistics of co-crystal structure of PARP-1 in complex with compound 11

2 Synthesis of intermediates in Scheme S1 Scheme S1 Reagents and conditions: a) SOCl 2, MeOH, reflux; b) NBS, AIBN, acetonitrile, tetrachloride, 70 C. Methyl 2-fluoro-5-methylbenzoate (1a) To a solution of 2-fluoro-5-methylbenzoic acid (5.06 g, 33 mmol) in methanol (110 ml), thionyl chloride (5.0 ml, 66 mmol) was added, and the mixture was stirred at reflux for 3 h. After removal of the solvent under vacuum distillation, ethyl acetate (100 ml) was added to the residue. The resulting mixture was washed with brine (40 ml 2), and then the organic layer was dried over anhydrous MgSO 4. After filtration and concentration to give compound 1a as a light yellow oil (5.45 g, 98.3%); 1 H NMR (500 MHz, CDCl 3 ) δ (ppm): 7.72 (dd, J 1 = 7.0 Hz, J 2 = 2.5 Hz, 1H), (m, 1H), 7.01 (dd, J 1 = 11.0 Hz, J 2 = 8.5 Hz, 1H), 3.92 (s, 3H), 2.34 (s, 3H). Methyl 2-chloro-5-methylbenzoate (1b) Following the preparation protocol of compound 1a, starting from 2-chloro-5-methylbenzoic acid, the title compound 1b was obtained as a light yellow oil (5.9 g, 97.2%); 1 H NMR (500 MHz, CDCl 3 ) δ (ppm): 7.62 (d, J = 2.0 Hz, 1H), 7.31 (d, J = 8.5 Hz, 1H), 7.21 (dd, J 1 = 8.5 Hz, J 2 = 2.5 Hz, 1H), 3.92 (s, 3H), 2.34 (s, 3H). O O Cl Methyl 5-(bromomethyl)-2-fluorobenzoate (2a) To a stirred solution of methyl 2-fluoro-5-methylbenzoate (1a) (6.72 g, 40.0 mmol) in carbon tetrachloride (100 ml) and acetonitrile (20 ml), azodiisobutyronitrile (1.29 g, 8.0 mmol) and

3 N-bromosuccinimide (7.47 g, 42.0 mmol) were added. The reaction mixture was heated at reflux for 1.5 h and then the mixture was diluted with DCM (100 ml) and washed with brine (50 ml 2), dried over anhydrous magnesium sulfate. After removal of the solvent under vacuum distillation, the residue was purified with column chromatography (ethyl acetate / petroleum ether = 150:1) to give compound 2a as a white solid (6.4 g, 65%); 1 H-NMR (300 MHz, CDCl 3 ) δ (ppm): (m, 1H), (m, 1H), (m, 1H), 4.48 (s, 2H), 3.94 (s, 3H). Methyl 5-(bromomethyl)-2-chlorobenzoate (2b) Following the preparation protocol of compound 2a, starting from methyl 2-chloro-5-methylbenzoate (1b), the title compound 2b was obtained as a white soild (4.8 g, 57.8%); 1 H-NMR (500 MHz, CDCl 3 ) δ (ppm): 7.97 (dd, J 1 = 6.5 Hz, J 2 = 2.0 Hz, 1H), (m, 1H), 7.13 (d, J = 9.5 Hz, 1H), 4.48 (s, 2H), 3.94 (s, 3H). Synthesis of intermediates in Scheme S2 Scheme S2 Reagents and conditions: a) Haloalkane, DIEA, acetonitrile, rt or 40 C or 70 C or aldehyde or ketone, DIEA, THF,

4 then NaBH(OAc) 3 ; b) TFA, DCM, rt; c) CBZ-Cl, Et 3 N, DCM, 0 C; d) Haloalkane, NaH, DMF, rt; e) 10% Pd/C, EtOH, H 2. rt; tert-butyl (1-ethylpyrrolidin-3-yl)carbamate (3a) To a solution of methyl tert-butyl pyrrolidin-3-ylcarbamate (651 mg, 3.5 mmol) in acetonitrile (20 ml), DIEA (0.92 ml, 5.25 mmol) and bromoethane (0.3 ml, 3.85 mmol) were added, and the mixture was stirred at room temperature for 2 h. After the removal of solvent under vacuum distillation, the residue was purified with column chromatography (methylene chloride /methanol = 40:1 to 30:1) to give compound 3a as a light yellow solid (600 mg, 80%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 6.16 (d, J = 8.4 Hz, 1H), 3.87 (s, 1H), 3.70 (s, 0.5H), 3.61 (s, 0.5H), (m, 4H), (m, 1H), 2.22 (brs, 1H), 1.53 (t, J = 6.0 Hz, 3H), 1.42 (s, 9H). tert-butyl (1-propylpyrrolidin-3-yl)carbamate (3b) To a solution of methyl tert-butyl pyrrolidin-3-ylcarbamate (651 mg, 3.5 mmol) in acetonitrile (20 ml), DIEA (0.92 ml, 5.25 mmol) and 1-bromopropane (0.38 ml, 4.2 mmol) were added, and the mixture was stirred at 40 C for 3 h. After removal of the solvent under vacuum distillation, the residue was purified with column chromatography (methylene chloride /methanol = 40:1 to 30:1) to give compound 3b as a light yellow solid (650 mg, 81%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 6.19 (d, J = 8.4 Hz, 1H), 4.63 (brs, 1H), 4.29 (brs, 0.5H), 3.92 (brs, 1H), 3.76 (brs, 0.5H), 3.64 (d, J = 10.0 Hz, 1H), (m, 2H), (m, 1H), (m, 1H), (m, 1H), 1.94 (brs, 2H), 1.43 (s, 9H), 1.04( t, J = 7.2 Hz, 3H). tert-butyl (1-butylpyrrolidin-3-yl)carbamate (3c) Following the preparation protocol of compound 3b, starting from tert-butyl

5 pyrrolidin-3-ylcarbamate and 1-bromobutane, the title compound 3c was obtained as a light yellow solid (390 mg, 53.7%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 5.10 (s, 1H), 4.21 (s, 1H), 2.96 (s, 1H), (m, 2H), 2.49 (brs, 2H), (m, 2H), 1.69 (s, 1H), (m, 2H), 1.42 (s, 9H), (m, 2H), 0.91 (d, J = 7.2 Hz, 3H). tert-butyl (1-isobutylpyrrolidin-3-yl)carbamate (3d) Following the preparation protocol of compound 3b, starting from tert-butyl pyrrolidin-3-ylcarbamate and 1-bromo-2-methylpropane, the title compound 3d was obtained as a light yellow solid (300 mg, 35.4%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 4.85 (s, 1H), 4.14 (s, 1H), 2.76 (s, 1H), 2.50 (s, 2H), (m, 4H), (m, 1H), (m, 1H), 1.43 (s, 9H), 0.89 ( d, J = 6.4 Hz, 6H). tert-butyl (1-isopentylpyrrolidin-3-yl)carbamate (3e) Following the preparation protocol of compound 3b, starting from tert-butyl pyrrolidin-3-ylcarbamate and1-bromo-3-methylbutane, the title compound 3e was obtained as a light yellow solid (420 mg, 82%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 4.91 (s, 1H), 4.16 (s, 1H), 2.83 (s, 1H), 2.58 (s, 2H), 2.43 (t, J = 7.2 Hz, 2H), (m, 2H), (m, 2H), 1.44 (s, 9H), (m, 2H), 0.89 (d, J = 6.4 Hz, 6H). tert-butyl (1-(pentan-3-yl)pyrrolidin-3-yl)carbamate (3f) Following the preparation protocol of compound 3b, starting from tert-butyl pyrrolidin-3-ylcarbamate and 3-bromopentane, the title compound 3f was obtained as a light

6 yellow solid (330 mg, 64%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 5.67 (brs, 1H), 4.33 (s, 1H), 3.30 (s, 1H), 3.04 (s, 1H), 2.95 (s, 1H), 2.68 (s, 1H), 2.48 (s, 1H), 2.32 (s, 1H), 1.94 (s, 1H), 1.65 (brs, 4H), 1.41 (s, 9H), 0.95 (t, J = 7.2 Hz, 6H). tert-butyl (1-(cyclopropylmethyl)pyrrolidin-3-yl)carbamate (3g) Following the preparation protocol of compound 3b, starting from tert-butyl pyrrolidin-3-ylcarbamate and (bromomethyl)cyclopropane, the title compound 3g was obtained as a light yellow oil (510 mg, 70.7%) 1 H-NMR (500 MHz, CDCl 3 ) δ (ppm): 5.33 (brs, 1H), 4.31 (s, 1H), 3.20 (s, 1H), 2.96 (s, 1H), 2.83 (s, 1H), 2.52 (brs, 3H), 2.34 (brs, 1H), 1.83 (s, 1H), 1.44 (s, 9H), 1.01 (s, 1H), 0.61 (d, J = 8.5 Hz, 2H), 0.23 (s, 2H). tert-butyl (1-(oxetan-3-yl)pyrrolidin-3-yl)carbamate (3h) To a solution of methyl tert-butyl pyrrolidin-3-ylcarbamate (465 mg, 2.5 mmol) in methylene chloride (5 ml), oxetan-3-one (0.88 ml, 15 mmol) and AcOH (0.2 ml) were added, and the mixture was stirred at room temperature for 6 h. Sodium triacetoxyborohydride (NaBH(OAc) 3, 3.18 g, 15.0 mmol) was added to the mixture and stirred at room temperature for 48 h and then methylene chloride (50 ml) was added. The resulting mixture was washed with brine (15 ml 2), and dried over anhydrous MgSO 4. After filtration and concentration, the crude product was obtained and purified with column chromatography (methylene chloride /methanol = 60:1 to 20:1) to give compound 3h as a white solid (45 mg, 7.5%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 4.92 (brs, 1H), 4.69 (t, J = 6.8 Hz, 2H), 4.61 (q, J = 6.0 Hz, 2H), 4.20 (brs, 1H), (m, 1H), 2.82 (brs, 1H), 2.57 (brs, 2H), (m, 2H), (m, 1H), 1.44 (s, 9H) 1-Ethylpyrrolidin-3-amine 2,2,2-trifluoroacetate (4a)

7 To a solution of compound 3a (215 mg, 1.0 mmol) in DCM (10.0 ml), TFA (0.73 ml, 10.0mmol) was added and then the reaction mixture was stirred at room temperature for 4 h. Then removal of the solvent under vacuum distillation to give compound 4a as a light yellow oil (220 mg, 96.4%); 1 H-NMR (400 MHz, DMSO-d 6 ) δ (ppm): (m, 3H), (m, 1.5H), (m, 2H), (m, 3.5H), 2.48 (brs, 0.5H), 2.24 (brs, 0.5H), 2.13 (brs, 0.5H), 1.97 (brs, 0.5H), 1.21 (t, J = 7.2 Hz, 3H). 1-Propylpyrrolidin-3-amine 2,2,2-trifluoroacetate (4b) Following the preparation protocol of compound 4a, starting from tert-butyl (1-propylpyrrolidin-3-yl)carbamate (3b), the title compound 4b was obtained as a light yellow oil (250 mg, 98%); 1 H-NMR (400 MHz, DMSO-d 6 ) δ (ppm): (m, 3H), 4.04 (s, 0.5H), 3.92 (s, 1H), 3.72 (s, 0.5H), 3.61 (s, 1H), 3.46 (s, 0.5H), 3.30 (s, 0.5H), 3.13 (brs, 3H), 2.47 (brs, 0.5H), 2.24 (brs, 0.5H), 2.11 (brs, 0.5H), 1.96 (brs, 0.5H), (m, 2H), 0.89 (t, J = 7.2 Hz, 3H). 1-Butylpyrrolidin-3-amine 2,2,2-trifluoroacetate (4c) Following the preparation protocol of compound 4a, starting from tert-butyl (1-butylpyrrolidin-3-yl)carbamate (3c), the title compound 4c was obtained as a light yellow oil (240 mg, 96%); 1 H-NMR (400 MHz, DMSO-d 6 ) δ (ppm): (m, 3H), 4.06(s, 0.5H), 3.94(s, 1H), 3.75 (s, 0.5H), 3.64 (s, 1H), 3.48 (s, 0.5H), (m, 3.5H), 2.47 (brs, 0.5H), 2.23 (brs, 0.5H), 2.11 (brs, 0.5H), 1.95 (brs, 0.5H), (m, 2H), (m, 2H), 0.88 (t, J = 7.2 Hz, 3H). 1-Isobutylpyrrolidin-3-amine 2,2,2-trifluoroacetate (4d)

8 Following the preparation protocol of compound 4a, starting from tert-butyl (1-isobutylpyrrolidin-3-yl)carbamate (3d), the title compound 4d was obtained as a light yellow oil (250 mg, 98%); 1 H-NMR (400 MHz, DMSO-d 6 ) δ (ppm): (m, 3H), (m, 2H), 3.78 (s, 0.5H), 3.69 (s, 1H), 3.50 (s, 0.5H), (m, 3H), 2.48 (brs, 0.5H), 2.26 (brs, 0.5H), 2.10 (brs, 0.5H), (m, 1.5H), 0.92 (d, J = 6.8 Hz, 6H). 1-Isopentylpyrrolidin-3-amine 2,2,2-trifluoroacetate (4e) Following the preparation protocol of compound 4a, starting from tert-butyl (1-isopentylpyrrolidin-3-yl)carbamate (3e), the title compound 4e was obtained as a light yellow oil (630 mg, 100%); 1 H-NMR (400 MHz, DMSO-d 6 ) δ (ppm): 8.44 (brs, 3H), (m, 2H), (m, 1.5H), (m, 3.5H), 2.47 (brs, 0.5H), 2.26 (brs, 0.5H), 2.15 (brs, 0.5H), 1.98 (brs, 0.5H), (m, 1H), (m, 2H), 0.89 (d, J = 6.8 Hz, 6H). 1-(Pentan-3-yl)pyrrolidin-3-amine 2,2,2-trifluoroacetate (4f) Following the preparation protocol of compound 4a, starting from tert-butyl (1-(pentan-3-yl)pyrrolidin-3-yl)carbamate (3f), the title compound 4f was obtained as a light yellow oil (300 mg, 99%); 1 H-NMR (400 MHz, DMSO-d 6 ) δ (ppm): (m, 3H), 4.04 (s, 0.5H), 3.89 (s, 1H), 3.74 (s, 0.5H), (m, 1.5H), 3.35 (s, 0.5H), 3.17 (brs, 2H), 2.44 (s, 0.5H), 2.26 (brs, 0.5H), 2.10 (brs, 0.5H), 1.99 (brs, 0.5H), (m, 4H), 0.90 (t, J = 7.2 Hz, 6H). 1-(Cyclopropylmethyl)pyrrolidin-3-amine 2,2,2-trifluoroacetate (4g)

9 Following the preparation protocol of compound 4a, starting from tert-butyl (1-(cyclopropylmethyl)pyrrolidin-3-yl)carbamate (3g), the title compound 4g was obtained as a brownish red oil (560 mg, 98.1%); 1 H NMR (500 MHz, DMSO-d 6 ) δ (ppm): 8.50 (brs, 3H), (m, 1.5H), (m, 1.5H), 3.53 (s, 1H), 3.35 (s, 0.5H), (m, 3H), 2.47 (brs, 0.5H), 2.29 (brs, 0.5H), 2.14 (brs, 0.5H), 2.00 (brs, 0.5H), (m, 1H), 0.61 (t, J = 7.6 Hz, 2H), 0.38 (d, J = 4.0 Hz, 2H). 1-(Oxetan-3-yl)pyrrolidin-3-amine 2,2,2-trifluoroacetate (4h) Following the preparation protocol of compound 4a, starting from tert-butyl (1-(oxetan-3-yl)pyrrolidin-3-yl)carbamate (3h), the title compound 4h was obtained as a light yellow oil (50 mg, 95%); tert-butyl 3-(((benzyloxy)carbonyl)amino)pyrrolidine-1-carboxylate (5) To a solution of tert-butyl 3-aminopyrrolidine-1-carboxylate (2.0 g, mmol) in methylene chloride (30 ml), DIEA (2.8 ml, mmol) and benzyl chloroformate (1.76 ml, 12.9 mmol) were added, and the mixture was stirred in ice bath for 3 h. Then the methylene chloride (50 ml) was added and washed with brine (10 ml 2), dried over anhydrous magnesium sulfate. After filtration and concentration, the crude product was obtained and purified with column chromatography (Ethyl Acetate /Petroleum ether = 1:5 to 1:3) to give compound 5 as a colorless oil (3.0 g, 87.2%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), 5.10 (s, 2H), 4.89 (brs, 1H), 4.25 (brs, 1H), (m, 1H), 3.41 (brs, 2H), (m, 1H), 2.11 (brs, 1H), 1.83 (brs, 1H), 1.45 (s, 9H). tert-butyl 3-(((benzyloxy)carbonyl)(methyl)amino)pyrrolidine-1-carboxylate (6a)

10 To a solution of tert-butyl 3-(((benzyloxy)carbonyl)amino)pyrrolidine-1-carboxylate (1.6 g, 5.0 mmol) in DMF (30 ml), NaH (300 mg, 7.5 mmol) was added and the mixture was stirred under argon at room temperature for 1 h. Then iodomethane (0.38 ml, 6 mmol) was added and the reaction mixture was stirred still at room temperature for 1 h. H 2 O was added to the mixture and then the solution was extracted with ethyl acetate (50 ml 2) and then the organic layer was washed with brine (40 ml 2). The combined organic layer was dried over anhydrous MgSO 4. After filtration and concentration, the crude product was obtained and purified with column chromatography (Ethyl Acetate /Petroleum ether = 1:5) to give compound 6a as a colorless oil (1.4 g, 84.8%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), 5.14 (s, 2H), 4.80 (brs, 1H), (m, 2H), (m, 2H), 2.86 (s, 3H), (m, 2H), 1.45 (s, 9H). tert-butyl 3-(((benzyloxy)carbonyl)(ethyl)amino)pyrrolidine-1-carboxylate (6b) Cbz N N Boc Following the preparation protocol of compound 6a, starting from compound 5 and bromoethane, the title compound 6b was obtained as a colorless oil (840 mg, 80.4%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), 5.15 (s, 2H), 4.60 (brs, 1H), (m, 2H), (m, 4H), (m, 2H), 1.45 (s, 9H), 1.14 (t, J = 6.4 Hz, 3H) tert-butyl 3-(((benzyloxy)carbonyl)(propyl)amino)pyrrolidine-1-carboxylate (6c) Following the preparation protocol of compound 6a, starting from compound 5 and 1-bromopropane, the title compound 6c was obtained as a colorless oil (300 mg, 73.7%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), 5.14 (s, 2H), 4.53 (brs, 1H), (m, 2H), (m, 4H), (m, 2H), (m, 2H), 1.45 (s, 9H), 0.86 (t, J = 7.2 Hz, 3H). tert-butyl 3-(methylamino)pyrrolidine-1-carboxylate (7a)

11 The mixture of compound 6a (250 mg, 0.75 mmol) and 10% Pd/C (75 mg) in ethanol (10.0 ml) was hydrogenated at room temperature and 1 atm for 3 h. The reaction mixture was filtered over a pad of Celiteand and then the solution was concentrated to afford compound 7a as a colorless oil (140 mg, 93.9%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 3H), (m, 2H), 2.44 (s, 3H), (m, 1H), 1.70 (brs, 1H), 1.46 (s, 9H). tert-butyl 3-(ethylamino)pyrrolidine-1-carboxylate (7b) H N N Boc Following the preparation protocol of compound 7a, starting from compound 6b, the title compound 7b was obtained as a colorless oil (440 mg, 90%). tert-butyl 3-(propylamino)pyrrolidine-1-carboxylate (7c) Following the preparation protocol of compound 7a, starting from compound 6c, the title compound 7c was obtained as a colorless oil (160 mg, 95.8%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 2H), (m, 2H), (m, 1H), 2.57 (t, J = 6.8 Hz, 2H), (m, 1H), (brs, 1H), 1.48 (q, J = 7.2 Hz, 2H), 1.44 (s, 9H), 0.92 (t, J = 7.2 Hz, 3H). Benzyl (1-butylpyrrolidin-3-yl)(methyl)carbamate (8a) To a solution of compound 6a (500 mg, 1.56 mmol) in DCM (10.0 ml), TFA (1.15 ml, 15.6 mmol) was added and then the reaction mixture was stirred at room temperature for 3 h. After filtration under vacuum distillation, acetonitrile (10 ml) was added to the residue. Then the DIEA (0.53 ml, 3.44 mmol) and 1-bromobutane (0.11 ml, 1.03 mmol) were added to the mixture. The mixture was stirred at 50 C for 4 h. After concentration, the crude product was obtained and

12 purified with column chromatography (methylene chloride /methanol = 50:1 to 40:1) to give compound 8a as a light yellow oil (280 mg, 64.5%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), 5.10 (s, 2H), 3.30 (brs, 3H), (m, 6H), (m, 1H), (m, 2H), 1.76 (brs, 2H), (m, 2H), 0.93 (t, J = 7.2 Hz, 3H). Benzyl (1-(cyclopropylmethyl)pyrrolidin-3-yl)(methyl)carbamate (8b) Following the preparation protocol of compound 8a, starting from compound 6a and (bromomethyl)cyclopropane, the title compound 8b was obtained as a light yellow oil (206 mg, 79.8%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), (m, 2H), (m, 4H), 3.00 (s, 3H), 2.87 (brs, 3H), 2.43 (brs, 1H), 2.24 (brs, 1H), (m, 1H), 0.70 (brs, 2H), 0.38 (brs, 2H). Benzyl ethyl(1-ethylpyrrolidin-3-yl)carbamate (8c) Following the preparation protocol of compound 8a, starting from compound 6b and bromoethane, the title compound 8c was obtained as a light yellow oil (197 mg, 77.2%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), (m, 2H), 4.13 (brs, 1H), (m, 8H), 2.61 (brs, 1H), 2.28 (brs, 1H), 1.45 (brs, 3H), 1.11 (t, J = 8.0 Hz, 3H). Benzyl (1-ethylpyrrolidin-3-yl)(propyl)carbamate (8d) Following the preparation protocol of compound 8a, starting from compound 6c and bromoethane, the title compound 8d was obtained as a light yellow oil (230 mg, 95.8%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 5H), (m, 2H), 4.14 (brs, 1H), 3.79 (brs, 1H), 3.64 (brs, 1H), (m, 6H), 2.63 (brs, 1H), 2.31 (brs, 1H), (m, 2H), (m, 6H).

13 1-Butyl-N-methylpyrrolidin-3-amine (9a) Following the preparation protocol of compound 7a, starting from compound 8a, the title compound 9a was obtained as a light yellow oil (100 mg, 93.4%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 6.48 (brs, 1H), 3.56 (brs, 1H), (m, 1H), (m, 1H), 3.23 (brs, 0.5H), (m, 1H), (m, 2H), (m, 2.5H), 2.49 (s, 3H), (m, 1H), (m, 1H), (m, 2H), (m, 2H), 0.92 (t, J = 7.2 Hz, 3H). 1-(Cyclopropylmethyl)-N-methylpyrrolidin-3-amine (9b) Following the preparation protocol of compound 7a, starting from compound 8b, the title compound 9b was obtained as a light yellow oil (100 mg, 96%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 6.48 (brs, 1H), 3.56 (brs, 1H), (m, 1H), (m, 1H), (m, 2H), 2.68 (d, J = 6.4 Hz, 2H), 2.51 (s, 3H), (m, 1H), (m, 1H), (m, 1H), 0.63 (d, J = 7.2 Hz, 2H), 0.29 (d, J = 4.0 Hz, 2H). N,1-diethylpyrrolidin-3-amine (9c) H N N Following the preparation protocol of compound 7a, starting from compound 8c, the title compound 9c was obtained as a light yellow oil (95 mg, 97.2%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): 3.92 (brs, 1H), (m, 1H), (m, 1H), (m, 2H), (m, 2H), (m, 2H), (m, 1H), (m, 1H), 1.38 (t, J = 7.2 Hz, 6H). 1-Ethyl-N-propylpyrrolidin-3-amine (9d) Following the preparation protocol of compound 7a, starting from compound 8d, the title

14 compound 9d was obtained as a light yellow oil (100 mg, 86.9%); 1 H-NMR (400 MHz, CDCl 3 ) δ (ppm): (m, 1H), (m, 1H), (m, 3H), (m, 2H), (m, 2H), (m, 1H), (m, 1H), (m, 2H), 1.33 (t, J = 7.2 Hz, 3H), 0.94 (t, J = 7.6 Hz, 3H).

15 1 H NMR Spectrum of Compound 5 1 H NMR Spectrum of Compound 6

16 13 C NMR Spectrum of Compound 6 1 H NMR Spectrum of Compound 7

17 13 C NMR Spectrum of Compound 7 1 H NMR Spectrum of Compound 8

18 1 H NMR Spectrum of Compound 9 13 C NMR Spectrum of Compound 9

19 1 H NMR Spectrum of Compound 10 1 H NMR Spectrum of Compound 11

20 13 C NMR Spectrum of Compound 11 1 H NMR Spectrum of Compound 12

21 13 C NMR Spectrum of Compound 12 O NH N O O N H Cl N 1 H NMR Spectrum of Compound 13

22 13 C NMR Spectrum of Compound 13 1 H NMR Spectrum of Compound 14

23 13 C NMR Spectrum of Compound 14 1 H NMR Spectrum of Compound 15

24 13 C NMR Spectrum of Compound 15 1 H NMR Spectrum of Compound 16 O NH N O O F N H NH

25 1 H NMR Spectrum of Compound 17 1 H NMR Spectrum of Compound 18

26 13 C NMR Spectrum of Compound 18 1 H NMR Spectrum of Compound 19

27 13 C NMR Spectrum of Compound19 1 H NMR Spectrum of Compound 20

28 13 C NMR Spectrum of Compound 20 1 H NMR Spectrum of Compound 21

29 1 H NMR Spectrum of Compound 22 1 H NMR Spectrum of Compound 23

30 1 H NMR Spectrum of Compound C NMR Spectrum of Compound 24

31 1 H NMR Spectrum of Compound 25 1 H NMR Spectrum of Compound 26

32 13 C NMR Spectrum of Compound 26 1 H NMR Spectrum of Compound 27

33 1 H NMR Spectrum of Compound28 13 C NMR Spectrum of Compound 28

34 1 H NMR Spectrum of Compound C NMR Spectrum of Compound 29

35 1 H NMR Spectrum of Compound 30 1 H NMR Spectrum of Compound 31

36 13 C NMR Spectrum of Compound 31 1 H NMR Spectrum of Compound 32 O NH N O O N N Boc F

37 13 C NMR Spectrum of Compound 32 O NH N O O N N Boc F 1 H NMR Spectrum of Compound 33

38 13 C NMR Spectrum of Compound 33 1 H NMR Spectrum of Compound 34 O N NH O CF 3 COOH O NH N F

39 1 H NMR Spectrum of Compound 35 1 H NMR Spectrum of Compound 36 O N NH O CF 3 COOH O NH N F

40 Table S1. The data collection and refinement statistics of co-crystal structure of PARP-1 in complex with 11. Data collection Space group P Cell dimensions a=48.63, b=92.31, c=164.08; =90, =90, =90 Wavelength (Ȧ) Resolution range (Ȧ) a ( ) Unique reflections (7005) Redundancy 11.9 (11.9) I/σ 17.7 (7.7) Completeness (%) 99.9 (99.8) b R merge (0.330) Structure refinement Resolution range (Ȧ) No. reflections No. heavy atoms 5612 c R work d R free Rms Deviations Bond length (Ȧ) Bond angles ( ) a Values in parentheses are for the data in the highest resolution shell. b R merge = Σ I i I m /ΣI i, where I i is the intensity of the measured reflection and I m is the mean intensity of all symmetry related reflections. c R work =Σ F o F c /ΣF o, where F o and F c are the observed and calculated structure factor amplitudes. d R free is the same as R work, but calculated on 5% reflections not used in refinement.